diff --git a/.eslintrc.json b/.eslintrc.json
index e091f381..04f9da7a 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,12 +1,6 @@
 {
 	"root": true,
 	"extends": [
-		"wikimedia/client-es5",
-		"wikimedia/jquery",
-		"wikimedia/mediawiki"
-	],
-	"rules": {
-		"max-len": "off",
-		"no-shadow": "warn"
-	}
+		"wikimedia/server"
+	]
 }
diff --git a/Gruntfile.js b/Gruntfile.js
index d80b20c5..36f9e0ba 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -4,10 +4,10 @@
  * @package CodeEditor
  */
 
-/* eslint-env node, es6 */
+'use strict';
 
 module.exports = function ( grunt ) {
-	var conf = grunt.file.readJSON( 'extension.json' );
+	const conf = grunt.file.readJSON( 'extension.json' );
 	grunt.loadNpmTasks( 'grunt-banana-checker' );
 	grunt.loadNpmTasks( 'grunt-contrib-clean' );
 	grunt.loadNpmTasks( 'grunt-contrib-copy' );
diff --git a/modules/.eslintrc.json b/modules/.eslintrc.json
new file mode 100644
index 00000000..877c66e8
--- /dev/null
+++ b/modules/.eslintrc.json
@@ -0,0 +1,11 @@
+{
+	"root": true,
+	"extends": [
+		"wikimedia/client-es5",
+		"wikimedia/jquery",
+		"wikimedia/mediawiki"
+	],
+	"rules": {
+		"max-len": "off"
+	}
+}
diff --git a/package-lock.json b/package-lock.json
index 6d6fd9ca..1bb16193 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -868,9 +868,9 @@
 			}
 		},
 		"node_modules/caniuse-lite": {
-			"version": "1.0.30001307",
-			"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001307.tgz",
-			"integrity": "sha512-+MXEMczJ4FuxJAUp0jvAl6Df0NI/OfW1RWEE61eSmzS7hw6lz4IKutbhbXendwq8BljfFuHtu26VWsg4afQ7Ng==",
+			"version": "1.0.30001309",
+			"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001309.tgz",
+			"integrity": "sha512-Pl8vfigmBXXq+/yUz1jUwULeq9xhMJznzdc/xwl4WclDAuebcTHVefpz8lE/bMI+UN7TOkSSe7B7RnZd6+dzjA==",
 			"dev": true,
 			"funding": {
 				"type": "opencollective",
@@ -6912,9 +6912,9 @@
 			}
 		},
 		"caniuse-lite": {
-			"version": "1.0.30001307",
-			"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001307.tgz",
-			"integrity": "sha512-+MXEMczJ4FuxJAUp0jvAl6Df0NI/OfW1RWEE61eSmzS7hw6lz4IKutbhbXendwq8BljfFuHtu26VWsg4afQ7Ng==",
+			"version": "1.0.30001309",
+			"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001309.tgz",
+			"integrity": "sha512-Pl8vfigmBXXq+/yUz1jUwULeq9xhMJznzdc/xwl4WclDAuebcTHVefpz8lE/bMI+UN7TOkSSe7B7RnZd6+dzjA==",
 			"dev": true
 		},
 		"chalk": {